Lock-seam for metal pipes.



No. 891,570. PATENT ED JUNE 23, 1908.

w. 0. SMITH.'

LOCK SEAM FOR METAL PIPES. urmonron FILED 1mm, 1907..

UNITED STATES PATENT OFFICE.

WILLIAM CARLETON SMITH, OF OMAHA, NEBRASKA, ASSIGNOR OF ONE-THIRD TO JOHN ALFRED PARDOE AND ONE-THIRD TO DAVID COLE, OF OMAHA, NEBRASKA.

LOCK-SEAM FOR METAL PIPES.

Specification of Letters Patent.

Patented June 23, 1908.

To all whom it may concern:

Be it known that I, WILLIAM CARLETQN SMITH, a citizen of the United States, residing at Omaha, in the county of Douglas and State of Nebraska, have invented a new and useful Improvement in Lock-Seams for Metal Pipes, of which the following is a specificatlon.

This invention relates to sheet metal pipes and more particularly to means for locking the seams of the same, the object being 'to provide the adjacent edges of the ipe-sections with locking means which can e easily and quickly locked together or unlocked as desired.

Another object of my invention is to provide a sheet metal pipe which is very simple and cheap in construction and one which can be spread out when unlocked, so that a number of the pipe sections can be nested together for transportation, storage or dis playing.

With these and other objects in view, the invention consists in the novel features of construction, combination and arrangement of parts hereinafter fully described and pointed out in the claims.

In the drawing forming a part of this specification: Figure 1 is a perspective view of my improved pipe showing the joint opened. Fig. 2 is an elevational view of the pipe showing the joint closed. Fig. 3 is a section taken on lines 33 of Fig. 2. Fig. 4 is a detail perspective view of the pipe showing the locking means.

In the drawings A indicates a sheet metal pjpe section having a crimped end A. The a j acent edges A A of the section are split adjacent their ends and the lower end or the crimped portion of the edge A is cut away. The edge A between the splits is bent downwardly at right angles to the pipe forming a locking ton ue B. The outwardly projecting portion eft at each end forms flaps B B the flap B being split to form a tongue B for the purpose hereinafter fully described.

The edge A between the split and cut away portion is bent downwardly and then upwardly forming a substantially U-shaped socket O in cross-section in which the downwardly projecting tongue B is adapted to fit, the flap B fitting under the crimped portion of the owerend of the pipe and the flap B fitting over the flap C formed by the outwardly projecting portion left at the upper end of the pipe. A notch D is formed in the u per edge of the pipe adjacent the flap C in w ch the tongue B is adapted to fit and be bent'back upon the pipe so as to securely lock the ends together.

Fromthe foregoing description it will be readily seen that when it is desired to lock thepipes together the lower ends of the pi e are pushed together so as to bring the flap B under the lower end of the pipe and the lower end of the tongue'B is placed in the lower end of the socket O, the upper end of the pipes are then forced together allowing the tongue B to drop into the socket C and securely lock the edges together.

Having thus fully described my invention,

what I claim as new and desire to secure by Letters Patent is 1. A sheet metal pipe section having a downwardly projecting tongue formed on one edge, a U-shaped socket formed on the adjacent edge, adapted to receive said tongue and a notch formed in the end of said pipe, and flaps formed on the edge first mentioned one of said fiaps being provided with a looking tongue adapted to fit in said notch.

2. A sheet metal pipe section having a downwardly projecting tongue formed on one edge, a U-shaped socket formed on the adjacent edge adapted to receive the tongue, and a notch formed in the end of said pipe, a flap formed on the lower end of the first mentioned edge adapted to fit under the lower end of the second mentioned edge, and a flap formed on the upper'end of the first mentioned edge adapted to fit over a fia formed on the second mentioned edge, said ast mentioned fiap being provided with a locking tongue for engagement with the notch formed in the pipe end.

3. A sheet metal pipe section having a tongue formed on one edge, and a socket formed on the adjacent edge adapted to receive said tongue, a fia formed on the lower end of the first named edge adapted to fit under the adjacent edge and a flap formed on the up er end of the first named edge, adapted to t over a flap formed on the end of the second named edge said fia being pro vided with a locking tongue aclhpted to engage said pipe.

4. A sheet metal pipe section having a crimped end, the adjacent edges of said pipe section being split adjacent their ends, one crimped portion being cut away from the split portion, one edge being bent downwardly between the splits to form a tongue, the adjacent edge between the split and cut away ortion being bent downwardly and upwarc ly to form a U-shaped socket adapted to receive the tongue, outwardly projecting flaps formed on the ends of the first named edge, the lower flap fitting under the lower erimped portion of the second named edge,

10 and the upper flap fitting over a flap formed fit in 'said notch and securely lock said edges 15 together.

WILLIAM OARLETON SMITH Witnesses:

IssrE FRANCE, A. J. KIROI-INER. 

